Please help - organic chem MO hybridizationWatch
So i missed my first year lecture in organic chemistry and am muddling my way though how to draw molecular orbital energy level diagrams. I'm a bit confused with the following diagram (which is also in my textbook)
In the hybridized state, why is there an electron in the unhybridized 2p orbital when it has a higher energy level than the sp2 orbitals? Would it not be more energetically favourable to put the final electron in with a pair and leave the unhybridized orbital empty?
A fully explained answer would be much appreciated because this same problem is tripping me up with other bonds too.
It's really hard to say without knowing what molecule this is from.